numbers = '8 3 -5 42 -1 0 0 -9 4 7 4 -4'

def high_and_low(numbers):
    min_num = None
    max_num = None
    numbers_list = [int(num) for num in numbers.split(" ")]

    for num in numbers_list:
        if not min_num and not max_num:
            min_num = num
            max_num = num

        if min_num > num:
            min_num = num

        if max_num < num:
            max_num = num

    numbers = " ".join((str(num) for num in [max_num, min_num]))

    return numbers